.tip {
    margin-top: 20px;
    margin-bottom: 10px;
    font-size: 14px;
    color: #666;
}

.ul {
    list-style-type: none;
}
.li {
    width: 200px;
    height: 50px;
    line-height: 50px;
    background: #ccc;
    margin-bottom: 1px;
    text-align: center;
}